AN ANALYSIS OF THE RELIABILITY OF GRAVIMETER MEASUREMENTS.
Abstract
Factors affecting reliability of gravimeter measurements are reviewed and results of laboratory test to determine the effect of ambient and time variations in pressure and temperature on a LaCoste-Romberg large geodetic gravimeter presented. By comparing both laboratory calibration measurements and field observation results for two identical instruments (LR-G-1 and LR-G-7) it is possible to evaluate the absolute reliability of values obtained. It is found that in field operations there is a short term (5-10 hour) random variability in response that amounts to as much as 0-1 mgal and that multiple connections over small increments in gravity having an internal accuracy of =0.02 mgal may differ with instrument by 0.2 mgal. This difference is of the same order as magnitude noted for large increments in gravity. It also appears that the calibration is significantly influenced if the magnetic moment of an instrument changes. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1964
- Accession Number
- AD0607479
Entities
People
- G. P. Woollard